Micrometer.



(No Model.)

WITNESSES Patented lune 4, MN.

F. ULLMER.

MICROMETER.

(Application filed May 14, 1900.)

2 Sheeta$heet I.

IN VEA/TOR a I inn/050' //,///2&

UNITED STATES PATENT OFFICE.

FREDERIC ULLMER, OF LONDON, YNGLAND.

MICROMETER.

SPECIFICATION forming part of Letters Patent No. 675,875, dated June 4, 1901. Application filed May 14, 1900. Serial No 16,591. (No model.)

To all whom it may concern.-

Be it known that I, FREDERIC ULLMER, a subject of the Queen of Great Britain, residing at London, county of Middlesex, England, have invented certain new and useful Improvements in Micrometers, of which the following is a full and complete specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to micrometers; and the object thereof is to provide a micrometer whereby extremely fine measurements of the dimensions of bodies may be easily and accurately made by the employment of a scale upon which variations from predetermined dimensions are magnified, being denoted by a movable pointer element.

The invention consists in the construction and arrangement of parts hereinafter specified.

In the accompanying drawings, forming part of this specification, in which like reference characters denote like parts in the several views, Figure 1 is a front view of a micrometer constructed according to my invention, showing an object in position to be measured thereby. Figs. 1 and 1 are sectional details of the construction shown in Fig. 1 looking downward; Fig. 2, a rear view of a portion of Fig. 1; Fig. 3, a front view of a modified form of construction, and Fig. 4 a front view of a still further modified form of construction.

In the practice of my invention, reference being made to Figs. 1 and 2, I provide a micrometer body 5, which may be readily grasped to support the instrument and which is provided at one end with a slidably-mounted scale-bar 6, in connection with which operates a pointer 7, fixed to the micrometerbody 5 adjacent said scale-bar.

Slidably mounted in the end of the body portion 5, directly opposite the scale-bar 6 at the longitudinal plane thereof, is a gripperjaw 8. A segmental scale-disk 9 is connected with the body portion 5 at the end thereof in which the gripper-jaw 8 is mounted and is provided with a scale 10, the graduations of which represent exceedingly diminutive variations in bulk of the object to be measured, as hereinafter described. If it is desired to measure upon the scale 10 variations in bulk of, say, one-thousandth of an inch, the spaces between the graduations of the scale 10 are read as thousandths of an inch, though in forming the scale 10 they may really be included between graduations a sixteenth of an inch or more apart, as will be readily understood.

Passed through the lower part of the scaledisk 9 is a rotatable spindle 11, and fixed eccentrieally upon one end thereof is a circular pointer-body 12, provided with a pointer 13, which operates in connection with the graduations of the scale 10. The pointer-body 12 is provided with a projecting stud l1, arranged centrally thereof, and the gripper-jaw 8 is provided with a projecting stud 14, and said studs 11 and 14 are connected by means of a link 15, whereby the pointer-body 2 is free to rotate eccentrically with the spindle 11, and thus reciprocate the gripper-jaw 8. The spindle 11 is shown in Figs. 1 and 2 and, as shown in Fig. 2, is provided at the side of the instrument opposite that at which the studs l1 and 14 are arranged with a pinion l6, and pivoted to the instrument-body at 17, adjacent said pinion, is a thumb-lever 18, provided with a segmental gear-head 19,which operates in connection with the pinion 16 and which is normally depressed by means of a plate-spring 20, which is fixed to the rear of the scaledisk 9 at 21.

At 22 is shown a block or other body the transverse dimension of which is presumed to be one inch, as shown upon the scale of the scale-bar 6 by the pointer- 7, which operates in connection therewith. In inserting the object 22 between the gripper jaw 8 and the scalebar (3 the former is raised by means of the thumb-lever 18 against the tension of the spring 20, the gripper-jaw 8 being operatively connected with the pointer-body 12 by the link 15, as above described. After the object 22 has been thus inserted the thumblever 18 is released and the pointer 13 assumes a certain position relative to the graduations of the scale 10, which position is caused by the variation in bulk of the object 22 from the dimensions indicated by the scale upon the scale-bar (3. As the pointer-body 12 is eccentrically mounted upon the spindle 11, the pointer 13 assumes its final position above described at either one side or the other of the zero-graduation of the scale 10, according to the bulk of the article 22, the plate-spring 2O maintaining the pointer 13 in such position. It is manifest that an exceedingly-slight actuation of the pointm body 12 at its point of contact with the gripper-jaw 8 will cause a greatiyiucreased actuation of the extreme end of the pointer 1 and that if such initial actuation of ihe pointer-body 12 causes the same to move at the point of contact with the gripper-jaw 8 ihrough a distance of, say, five one-thousantl at an inch the extreme end of the pointer ill will register with the fifth graduations ot the scale 10 at that side of the zero graduations thereof as predetermined by the excess or the coi'itrary of dimension of the object 22 as over or under the dimension thereof indicated by the pointer 7 upon the scale-bar o.

In Fig. l I have shown a transverse sec tion of Fig. 1 taken through the center of the pointer-body 12, and in Fig. 1 I have shown another transverse section taken through the pointer 7, and by means of these views the details of the construction shown in Figs. 1 and 2 will be clearly understood.

In Fig. 3 is shown a micrometer particularly adapted for measuring work which is being reduced in dimensions in a turninglathe. In the body portion 5 of the micrometer shown in this figure is slidably mounted a scale-bar 6, provided with an angularlydirected end portion 6*", which is brought to bear upon the object 22 to be measured. The pointer 7 is fixed to the body portion 5 and operates in connection with a scale upon the scale-bar 6. The body portion 5 is also provided on. one side with a knob or handle 5*, whereby the device maybe readily supported and handled, and said body portion is likewise provided at the upper part thereof with a segmental scale-bar upon which is arranged a scale 10*, the graduations of which we may assume are the same as in Figs. 1 and 2 and designed to represent thousandths of an inch. The body portion is provided with a central head or projection 5 which projects into a position beneath the scale-bar 9*, and mounted therein is a spindle ill", to which is eccentrically secured a circular pointer-body 15!, provided with a pointer 13*,

which operates in connection with the scale 10. Slidably mounted in the body portion 5, beneath the pointer-body 12, is a gripper-jaw 8, provided with a projecting stud or pin 14, and a link 15* operatively connects the stud or pin 14 with a projecting stud or pin ll, arranged centrally of the pointer-body 12. I also provide in this construction a thumblever 18, similar to the thumb-lever 18 in Figs. 1 and 2, which operates in connection with the rear end of the spindle 11 in the same manner as the correspending parts cooperate in Figs. 1 and 2 of the drawings, said thumb-lever 18 being normally depressed by means of a plate-spring 20", similar to the spring 20 in Figs. 1 and 2.

In this form of construction the object 22 to be measured is brought to bear upon the angular end portion 6 of the scale-bar 6 and beneath the gripper-jaw 8 by raising said gripper-jaw by means of the thumb-lever 155 and then allowing the spring 20 to depress said thumb-lever and bring the gripper-jaw S to bear directly upon the object 22, thus indicating upon the scale 1O the variation in dimension of the object 22 from the dimensions denoted by the scale upon the scale-bar 6 in the same manner as hereinbefore described in connection with the construction shown in Figs. 1 and 2 of the drawings.

.In Fig. 4 I have shown a form of micrometer particularly adapted for measuring the diwell as other obwhich type-bodies is shown at The body portion 5 in this form of construction is provided with a pair of oppositelydirected arms 5, with the ends of which is connected the segmental scale-bar 9 The graduations of the scale 10 on the scale-bar 9* represents extreinelyminute measurements, the same as in Figs. 1 and 3, and the body portion 5 is provided with a projecting ledge 5, upon which the type-body 22 is placed for measurement, and passed through said body portion 5 is a turnable spindle 11 to which is fixed eccentrically a pointer-body 12, which is provided with a pointer 13. The pointer-body 12 is approximately circular in form, whereby when it is engaged with the type-body 22 it is caused to determine the position of the pointer 13 with relation to the scale 10, thus denoting upon the said scale the dimensions of the type-body. It will be understood that in Fig. 4 the pointerbody is engaged directly by the object to be measured, thus disposing with the sliding gripping-jaw shown in the other figures.

I do not limit myself to the specific construction and arrangement of parts herein specitied, but reserve the right to vary the same within the scope of my invention.

Having fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A micrometer, embodying a body portion, a scale-bar slidably mounted therein, said body portion being provided with a scaledisk, and a turnable spindle, a pointer-body eccentrically fixed to said spindle and providcd with a pointer which operates in connection with said scale-disk, a gripper-jaw slidably mounted in said body portion and operatively connected with said pointer-body centrally thereof, said spindle being provided with a pinion, and a thumb-lever provided with a gear-head which operates in connection with said pinion, substantially as shown and described.

2. A micrometer, embodying a body portion, a scale-bar slidably mounted therein, said body portion being provided with a scaledisk, and a turnable spindle, a cam pointerbody eccentrically fixed to said spindle and provided with a pointer which operates in In testimony that I claim the foregoing as IO connection with said scale-disk, a grippermy inventionlhnvc signed my name, in presjaw slidably mounted in said body portion once of the subscribing witnesses, this 26th and operatively connected with said pointerday of April, NON.

body centrally thereof, said spindle being: FREDERIO ULLMER provided with a pinion, and a spring-actuated thumb-lever provided with n gear-head which \Vitnesses:

operates in connection with said pinion, snh- GEORGE Fimpnmoic WARREN,

, stantially as shown and described. WALTER JAMEs SKERTEN. 

